Dallachy Creek is a significant tidal estuary system located approximately 15 kilometers north of Cardwell on Queensland's Cassowary Coast. The water body encompasses the tidal portions of Dallachy and Whitfield creeks, extending into coastal waters outside the creek mouth. It is a declared Fish Habitat Area (FHA-042) covering 1,710 hectares, managed at the highest conservation level (Management A) for the protection of essential fish habitat. The system is characterized by extensive mangrove stands, primarily Rhizophora species, Melaleuca forests, and a mix of subtidal, intertidal, vegetated, and unvegetated salt flats. Its location adjacent to the Great Barrier Reef World Heritage Area underscores its ecological importance. The area supports a diverse fishery that is vital for recreational, Indigenous, and commercial fishing activities.